66 dart electrical problems

The horn going off is quite amusing....LOL. I would suspect that to be caused by crossed wires, probably in the 10 pin column connector where both the horn wire and the wires to the turn signals go through.

The parking lights come from the headlight switch; if the headlights work, then it is probably the headlight switch, or the wire from the headlight switch from the P terminal if the front parking lights don't work, and the wire from the R terminal of the rear parking lights don't work.

And the turn signals and brake go through the turn switch and the column connector mentioned above, and are both powered from the same fuse. That fuse's wire may not be connected right or the fuse or its holder are not good, or thr turn signal switch is not good. If the dome light works, it is not the fuse as it also feeds that.

Find your diagram here: www.mymopar.com And get to tracing, either by visual checks or with a 12v test light or meter, or a combo of techniques; hard to do anything else. Seems like all would be good with new wiring.......